Below is a three month price history chart comparing the stock performance of HLX vs.

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When Farrell and his colleagues discovered HLX-1in 2009, it was the first intermediate-mass black hole known.

MSN: Rare Black Hole Survives Galaxy's Destruction

Below is a three month price history chart comparing the stock performance of EP, versus HLX and TRGP.

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Below is a three month price history chart comparing the stock performance of NOV, versus HLX and CKH.

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Below is a three month price history chart comparing the stock performance of BWP, versus TOO and HLX.

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At the closing bell, HLX is off about 1.2%, while WPO is trading flat on the day Monday.

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Besides revealing clues about the lost galaxy, the black hole itself, called HLX-1 (Hyper-Luminous X-ray source 1), is scientifically interesting, researchers said.

MSN: Rare Black Hole Survives Galaxy's Destruction

According to the ETF Finder at ETF Channel, HLX and WPO collectively make up 1.15% of the iShares Morningstar Small Value Index Fund ETF (JKL) which is lower by about 0.2% on the day Monday.

FORBES: Helix Energy Solutions Group Larger Than S&P 500 Component Washington Post Co.